I haven't done enough C to need it, but it's a relatively common C idiom (not sure about PHP though). It's usually used with a goto jump (label inside if (0))

I haven't done enough C to need it, but it's a relatively common C idiom (not sure about PHP though). It's usually used with a goto jump (label inside if (0)) to clean up after an error. That way during normal execution the label code never executes. (I hope I remember this correctly.)